Since it says “AWS Personal Health Dashboard gives you fine-grained access control so that you can setup permissions based on event metadata.”, I would think AWS Organization can manage users’ access as well.

" AWS Personal Health Dashboard can integrate with Amazon CloudWatch Events, enabling you to build custom rules and select targets such as AWS Lambda functions to define automated remediation actions." and “The dashboard also provides forward looking notifications, and you can set up alerts across multiple channels, including email and mobile notifications, so you receive timely and relevant information to help plan for scheduled changes that may affect you.”, I would also think that needs starting with Cloudwatch first.

AWS Personal Health Dashboard gives you fine-grained access control so that you can setup permissions based on event metadata. This allows you to grant or deny access to an AWS Identity and Access Management (IAM) user based on such attributes as event types, event types of a particular service, or other role-based attributes. With fine-grained access control, you can limit access of sensitive alerts, such as those related to security, to only those users that need to see them."